I guess it would be nice to add a coach or two, especially coaches who can work on attacking patterns. But, I am not into that it is all up to coaching, and I think it is players that are weak in quality and mentality. Not all of them, it is a mix.
Why I think that? Check out playing style of Williams during games and Shaw and Young. All of them are different. When Williams is playing you can see he is running his brains out to give option to his teammates on the flanks, to overlap, to go behind players and take them to open space for wingers. When Shaw is playing you can't see that. When Young is playing it is happening once or twice in the game, but I guess it is more cause he can't track back. So, if it is coaching why Williams and Shaw don't have similar patterns? I think that Ole ask from them to make those runs, but Shaw just don't understand when to make a run and where to run, and he is just pretending to make those runs and stop as soon as possible. Also, maybe he is not fit enough so he knows that he would get injured if he makes those runs with full speed. I can't remember when I saw him running at full speed last time. Maybe it is injury concern in his head. On the other hand, Williams is running forward as soon as there is space in front and as soon as he pass the ball. My thought is that Ole wants that, what Williams is showing, and that only reason why he is not playing every game is that he is just a kid and he doesn't want to get him in trouble with injuries. He wants to keep him fit and to gain experience once a week.
Also, I think it is similar on the right. It looks to me that AWB is improving in that department and that is last few games against smaller teams he did better than before. Still, lot of space for improvement. Maybe, he is tired as well as he is playing almost every game and introduction of Laird or Dalot would help him to get some rest now and than.
Another issue is passing forward. When Matic is playing you will see he is waiting to execute pass between lines to number 10. He is doing that in every game a few times. Maguire and Lindelof are trying to do the same. The problem is that number 10 is more often than not hiding behind the players, so DM/CB can't execute that pass. They are afraid of interception, that with speed of our CB/DM partnership can lead to a goal conceded. So, they are executing those passes only when they are 90-100% sure that they will succeed which limits our chances. So, it is up to the players to open up for the pass, and to have pace to track back ad cover if something goes wrong. Also, coaching as players should move and open up better, but if they don't have it it is not like Ole has too many options.
Also, even when we make a space behind midfielders, and our Number 10 get the ball, our final pass is terrible. Decision making and executing are not on the PL level, and not on world class level. Whoever is playing it is the same. Mata is the only one that can deliver good ball, but he is slow to make that space and rarely is in position to do that. Pereira has bad decision making and vision, and Lingard doesn't have anything. Si, it is up to the players, although Ole could try Gomes there.
Also, forwards are issue. Movement in the box. It is not something you can learn easily, you need to have that in you, and Martial doesn't have that. He is more like second striker or winger, more like number 10. Also, passing, decision making in final third is something our players are not very good at. Maybe you can improve there a little bit with coaching, but to have it like Inzaghi or Chicharito, I doubt you can learn that.